Concerning steerable internal duct thrusters, what statement is true?

Correct Answer: Option D — The thrust direction of the steerable internal duct thruster is determined by the orientation of the water discharge vectoring ring.

Steerable internal duct thrusters, often called waterjets, utilize a vectoring ring or nozzle at the discharge. By physically rotating this ring, the operator directs the water discharge vector, thereby controlling the direction of the resulting thrust force without needing to change the pump's rotation or impeller pitch.